Automatic switch



Nov. 1o, 1925. 1,560,531

W. G. BLAUVELT AUTOKTIC SWITCH Filed May 24, 1924 Patented Nov. 10, 1925.

UNITED STATES PATENT OFFICE.

WILLIAM G. BLAUVELT, OF NEW YORK, N. Y., ASSIGNOR Ty AMERICAN TELEPHONE AND TELEGRAPH COMPANY, CORPORATION OF NEW YORK.

AUTOMATIC SWITCH.

Application flled May 24, 1924.

To all wlw/m t may concem:

Be it known that I, VILLIAM G. BLAUvm/r, residing at New York, in the county ot New York and State of New York, have invented certain Improvements in Automatic lfwitches, ot which the following is a specilicat-ion.

The present invention relates to telephone systems and more particularly to switches l for use iny the automatic establishment ot connections in such systems.

The invention is particularly applicable to switches of the type having terminal ban is in the form of a panel with contact '"f terminals projecting therefrom. It is customary to arrange these terminals in rows both vertically7 and horizontally, each horizontal row being connected to a particular outgoingl conductor. These outgoing conductorsv are q arranged into sets which make up the varieach conductor of a trunk for each brush set.

It is an object ot the present invention to provide a novel arrangement of the elements of such a switch.

A feature of the invention lies in making the channels formed by the contact terminals individual to the brush sets moving in them.

Another feature ot the invention lies in the use of certain rows ot contact terminals in common by adjacent brush sets.

The invention has been" disclosed in connection with a switch of the type described and claimed in U. S. Patent- 1,123,695 to E. B. Craft and J. N. Reynolds, granted J anuary 5, 1915.

In the drawing Figure 1 is a cross-section through the panel bank and the brush sets. Fig. 2 is a face View of the panel showing the tips only of the brushes.

Serial No. 715,709.

The panel bank shown is made ol alternate strips ot metal 1 and insulation 2, the metal strips having projecting lugs Jfor the purpose ot being engaged by the brush sets it and Referring to Fig. 2 strips 6, 7 and 8. are connected with one outgoing trunk, strip 6 with the tip, strip 7 with the sleeve and strip 8 with the ring conductors of that trunk (not shown). Similarly strips 9, 10 and 11 are connected with the conductors ot a second outgoing trunk and so on. These strips are so disposed that the lugs or contact terminals are arranged in vertical rows projecting` from the panel.

An inspection of the drawing will show that the lugs on the tip and ring strips 6, 8, 9 and 11 are twice as tar apart as the lugs on the sleeve strips 7 and 10 and are alternately disposed between the sleeve lugs. This arrangement forms channels 20, 21, 22 and 23 within which the tips of brushes 12 to 15 and 16 to 19 move. It is to be noted that channels 2O and 21 are individual to brush set 12 to 15 and channels and 23 to brush set 16 to 19.

Referring now to Fig. 1, it will be noted that brushes 12 to 15 and 16 to 19 are s0 mounted that the inner pairs 13, 14 and 17, 18 tend to move toward one another while the outer pairs 16, 19 and 12, 15 tend to move outward so as to engage the inside of the corresponding terminal lugs. Devices 24 and 25 are provided for controlling the engagement of the brushes with the terminal lugs. Device 24 is shown in its normal position holding the brushes 12 to 15 away from the contact lugs. Device 25 is shown in its tripped position permitting the brushes 16 to 19 to engage the contact lugs. Brushes 19 and 12 are so arranged as to make contact with the opposite sides of the same lug 26. Supposing that lug 26 is on av strip connected with the tip conductor of the trunk, then both brushes 19 and 12 must be wired to the tip of the incoming trunk. It is, theretore obvious that the wiring ot adjacent brush sets must be in reverse order.

From the foregoing it is clear that the arrangement ot the present invention provides a pair ot channels individual to each brush set and, therefore, there is no chance of adjacent brush sets interfering with one another in their movement over their corresponding terminals. It also provides for the common use of certain rows of terminal lugs by adjacent brush sets thuspermitting the switch strnctn-reseto be mounted on closer centers. `Where this is not desirable it permits making the` contact terminals, Wider enclf 'hence -strcngcrencl Ayless subject 'to weer, The present invention tl-l'ciefoi'e, is especial# ly useful in producing economies in telcphone systems by permitting either' more switches for a given termi-nal bank area by increasing the life of the terminal banks. It further produces` economy. in reducing the. likehl ed of accident oi' lema-ge to the switches. it. reduces the emo-untA ofi metal in two-thirds ofthe termi-nelstrips which saving, althonghL smally inl the individu-1lstripfiif-Jhen nniltiphetl by the number oli- :ssm'y for evene.. single olice,V

stripes ne@ amounts to at cnnsicleiable sem lit/*het is claimed.- f

l. ln an automatic comprisingfel plurality of projecting con'- tactlugs arranged .in rows fornnnffwchennels therebetween, and plurality: ofiibi'nsh sets` for engaging seid terminal lugs and switch, e terminal bank:

having `theirV tips. positioned for. travel in said channels, a pair osaid chennelstbeing individuel to each seid brush sett 2. ln an automatic switch, n terminal bank comp s in'" e plurality; projecting contct lugs arreng'erlin rows, and e plural- 30 ity of brush ior making contact with said'terminal lugs, certain rows of said lugs beingv accese-i ecommen to adjacent brush sets.

3. ln an automatiobenk coinprisi n contectlngs er nels therelcetWeei-i7 enclaeplnrelity oui/brush sets for; engeging'f sa-icllrt-erminnl lugs' and hiring; their tips positioned for tre-vel in said channels, i pair oit' said channels :bein-g individual tozezich said brush set and `certain rows offs-eid lugs being accessible. inl common to. adjacent .brushsets In testimony whereof, Ihetve signed'rmy name to thisrspecicetion this; 17th dey of Mey, 192%. Y t

' `VVLLIAM 1G. BLAUVELT.' 

